Design and Numerical Study of a New Hybrid CSS-SAGD Process Using Horizontal Wells for Recovering Heavy Oil

Jian Li, Xin Zhao, and Zhangxing Chen


The cyclic steam stimulation (CSS) and steam assisted gravity drainage (SAGD) processes have extensively been applied as standard methods for Canadian oil sands extraction. Recently, many studies have been concentrated on the CSS with horizontal wells and hybrid CSS-SAGD processes. In this article, a new hybrid CSS-SAGD process with two CSS horizontal wells and a single SAGD well is developed and investigated for shallow reservoirs by using the Fourth SPE Comparative Solution Project adapted for oil sands reservoirs. Compared with the conventional CSS process, it is shown from simulation results that this new hybrid CSS-SAGD process is a more efficient recovery process.